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    <title>Document</title>
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    标签从功能上分类

    <div>块级元素</div>
    <hr>
     <div>块级元素</div>
     <h1>一级标题</h1>
     <h2>二级标题</h2>
     <h3>三级标题</h3>
     <h4>四级标题</h4>
     <h5>五级标题</h5>
     <h6>六级标题</h6>
     <p>段落标签</p>
     <section>块级元素</section>
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          <span>行内元素</span>
          <span>行内元素</span>
          <em>文字斜体</em>
          <i>文字斜体</i>
          <b>加粗效果</b>
          <strong>加粗效果</strong>
          <sub>下标</sub>
          <sup>上标</sup>

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